InCallUI: fix smartcover always showing  answer fragment

It seems the deleted lines were causing the issue as InCallUI properly handles logic for
showing and hiding the fragment itself.

Change-Id: I1d45b49ae48931adf48faa555296a467373e9247
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_InCallUI into android-4.4